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J. OAIRNES. MOLDING TURBINE WHEELS No. 60,686, Patented'Jan: 1, 1867.

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IMPROVEMENT IN MOULDING TURBINBWIIEELS.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JAMES CAIRNES, of the city and county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Moulding Turbine Wheels; and I do hereby declare that the following is a full and exact description thereof, reference being had to. the annexed drawings, and to the letters of reference marked thereon.-

The nature of my invention and improvement will be understood by the following description.

In the accompanying drawings, which represent Jacob Luthers plan of wheels- Figure 1 is a horizonta section 'of a series of cores for forming the moulds for the buckets,which cores are arranged around the central patternring, B, and within the flask, D. I

Figure 2 is a view from the inside of one of thecores, O.

Likelett'ers in all the figures indicate the same -parts.- I

A is the central plate of'the wheel. B is a ring pattern which encircles. saidplate. There are cores, -.G, arranged around the ring B, each of which has a depression, a, to forma space for the metal to formabucket. Dne of the cores '0 is shown detached in fig. 2. In this figure the curvature-and form of the buckets are represented. From the outer edge of the buckets to the peripheries of the cores the latter have a tight fit beyond the bucket spaces, 6, to form the outer edge of .the buckets. D is the flask, between which and the series of cores 0 there is the annular space, 0, to be rammed in with sand in the usual manner of moulding. Wroughtiron buckets may be combined with the ring of the wh'el formed by means of the pattern ring B, by inserting the buckets in thespaces b after the said pattern rim is withdrawn, the 'inner ends of the buckets extending.

into the ring space. In this case, for the purpose of giving additional security to the connection of the buckets. .with the rim, the core G should form enlarged fillets, as indicated by red lines.

The operation is as follows The central pattern for forming the plate A is laid on the sand floor, and the ring pattern B placed around it. Then the cores 0 are placed around the ring, forming a continuous core with the spaces b for forming the buckets between the separate cores. The flask D is then placed in position, and the annular space 0 is filled in with sand and rammed. This completes the operation of moulding. Then the ring pattern B, which forms the space for the rim of the wheel, is withdrawn.

Having thus fully described-my improved mode of moulding turbine wheels, what I claim therein as new, and desire to secure by Letters Patent, is

Forming the moulds for the buckets of turbine wheels, by means of the cores G, without the use of a pattern, the said cores having a close fit outside of the bucket spaces 6, as and for the purpose specified.

In testimony that the above is my invention, I have hereunto set my hand and afiixed my seal this 14tl day of June, 1866.

JAMES CAIRNES. [L. s.]

witnessesi STEPHEN .Usrrox, W. W. Douennnrr. 

